Improvement in valves for direct-acting engines



H. A. J'AMTESBN.

Valvos for Direct-Acting Engines, r NO- 3- -Patented.lah20;1874=*.

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steam-pump.

. ports of the pump or machine.

NITED STATES PATENT OFFICE.

HENRY A. JAMIESON, OF BROOKLYN, NEW YORK, ASSIGNOR TO HIMSELF AND GEORGE W HITTAKER, OF SAME PLACE.

iMPROVEMENT IN VALVES FOR DIRECT-ACTING ENGINES.

Specification forming part of Letters Patent N0. 146,683, dated January 20, 1874; application filed August 4, 1873.

CASE A.

To all whom it may concern:

Be it known that I, HENRY A. JAMIESON, of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Valve for Direct-Action SteamFngines for Operating Pumps and other Apparatus, of which the following is a specification:

Figure 1 is a vertical transverse section of my improved valve, showing it applied to a Fig. 2 is a vertical longitudinal section thereof. Fig. 3 is a horizontal section of the same on the line 0 c, Fig. 1. Fig. 4 is a vertical transverse section on the line k k, Fig. 5. Fig. 5 is a'horizontal section on the line 0 k, Fig. 4.; and Fig. 6 is a diagram of the valve -surface, when the same is spread out into a plane.

Similar letters of reference indicate corresponding parts in all the figures.

This invention relates to a new arrangement of a compound oscillating and slide valve, which is to be applied to steam-pumps and other apparatus for regulating the admission of steam to, and its escape from, the

The invention consists in the combination of an oscillating and sliding valve of peculiar construction, with a cylindricalsteam-chest, having peculiarly-placed steam-passages that coincide with those of the valve, ashereinafter more fully described.

In the accompanying drawing, the. letter A represents a steam-chest, placed across and over a steam-cylinder, B, with which it connects by means of ports a and b, that are shown by dotted lines in Fig. 3.

The chest A is, in part, filled by a cylindrical valve, 0, which valve connects at one end with a rockshaft, D, in such manner that it will be oscillated by means of said rock-shaft, which has a projecting head or knob, 01, entering a recess in the end of the valve, while, at the same.

time, the valve may have independent longitudinal play on such shaft I), the recess aforementioned being long enough to give the required longitudinal play to the valve. The shaft D receives oscillating motion by suitable link mechanism, substantially in the same manner in which rock-valves are moved by slmilar or other means. The ends of the valve 0 are of such size as to completely fill the cavity within the steam-chest transversely;

but near the ends the valve has annular grooves e and f,which are clearly shown in Figs. 2, 3, and 5, and also represented by channels 0 and f in Fig. 6. These two annular channels or grooves connect with'each other by a longitudinal channel, g, which is i minates at opposite sides in narrow tapering-u recesses, h and 71/2, the recess b being on the same side of the valve in which there is the port b, and the other recess 7L1 on the side of the port a. From the channel 0 extends at one side of the valve, and toward the middle of the same, a longitudinal channel, j, and

another longitudinal channel, 1, extends at the other side from the groove f toward the middle of the valve. The channel j is on the same side on which there is the port a, while the channel I is on the side 011 which there is the port I).

For the still better understanding of the apparatus it is necessary to remark that the annular channel e is at that end of the valve which connects with the shaft D. Into the steam-chest A are cut on opposite sides thereof, but in line with the axis of the cylindrical valve, two passages, m and a. The passage m extends from that end of the chamber A which is opposite the shaft D, toward the middle of the chamber, and is on the same side as the channel j, in the valve. The passage n extends from the other end of the chamber toward the middle, and is on the same side as the passage Z in the-valve. it

I prefer to form these two passages on and n in the edge of the semicylindrical lower part of the steam-chest, so that such passages will be closed on top by the semi-cylindrical cap of the chest.

The operation is as follows: Steam is admitted to the upper part of the steam-chest through a pipe, 0, into the longitudinal channel g of the valve, and thence into the annu. lar channels a and 5 hen the valve is in the position shown in Figs. 4 and 5, its channel I will be in line and communicate with the passage n in the steam-chest. In' such position also the valve will strike or bear nearly against that end, 1), of the steam-chest that receives the shaft D. In this position,furthermore, the channel f will be directly'ahove the port I), as indicated by dotted lines in Fig. 5. The channel a will not be above any port, but the cavity h will connect the port a with the exhaust-port i. The beveled recess hfrom the exhaust chamber h, communicates with the passage m of the steam-chest, as shown in Fig. 4. Thus steam is admitted to the port I), and at the same time the port a is allowed to exhaust into '1 while the end q of the steamchest is also connected, through the passage m and recess h ,with the chamber h, to exhaust what steam it may contain. In' this position, however, the valve does not long remain, because the steam that is from the passage f, channel I, and passage n, conducted to the end 19 of the steam-chest, arrives behind the end 1; of the slide-valve, and moves said valve toward q, the exhaust-connection m of such latter-namedend facilitating such movement. At the end of the longitudinal stroke of the valve thus produced, the channel Z will no longer be in connection with the passage Z 02, nor will the exhaust-recess 7L communicate with the passage m, but all communication of these passages with the channels and the valve willbe interrupted. Thereupon, byt-he link mechanism connectedwith the valve D, the same will be swung in the direction of the arrow 1, shown in Fig. 4, until the channel j of the valve arrives in line and communicates with the steam-passage m and the exhaustrecess h iu connection with the steam-passage n; All'theparts will then be in the posi tion shown in Figs. 1, 2, and 3. The channel 6 will then be above the port a, while the chair nel f will be out of line of the ports, and the port 1) connecting with the exhaust. Steam is then admitted through c to the port a, and also through the passagejn to the endg of the steam-chest, while at the same time the port I) will exhaust, and the end 1) of the steamchest also exhaust by the connection a, 7L2 71, and The steam thus admitted to the cylinder B will cause the piston thereof to move forward in the direction of the arrow shown in Fig. 1; but the steam admitted to the end q of the steam-chest will cause the valve 0 to he pushed toward the end 19 until all connec tions with the passages on n will again be interrupted', whereupon the valve will he swung I again by the link-connection, but this time in the direction of the arrow 2, (shown in Fig. 4,) to bring the parts back again into the posi tion shown in Figs. 4 and 5.

What I claim as my invention is The combination of the reciprocating and oscillating valve 0, having the passages c f g, channels j Z, and cavity h h 7L2, with the steamchest A, having the passages wand 02, substantially as specified. I

HENRY A. JAMIESON.

Witnesses FRED. HAMEs, I A. OGDEN :HEGEMA'N. 

